English verb conjugation
MUST PURL

Regular verb: purl - purled - purled

Affirmation

Simple form	V-ing form
I must purl you must purl he must purl we must purl you must purl they must purl	I must be purling you must be purling he must be purling we must be purling you must be purling they must be purling
Perfect	V-ing perfect
I must have purled you must have purled he must have purled we must have purled you must have purled they must have purled	I must have been purling you must have been purling he must have been purling we must have been purling you must have been purling they must have been purling

Negation

Simple form	V-ing form
I mustn't purl you mustn't purl he mustn't purl we mustn't purl you mustn't purl they mustn't purl	I mustn't be purling you mustn't be purling he mustn't be purling we mustn't be purling you mustn't be purling they mustn't be purling
Perfect	V-ing perfect
I mustn't have purled you mustn't have purled he mustn't have purled we mustn't have purled you mustn't have purled they mustn't have purled	I mustn't have been purling you mustn't have been purling he mustn't have been purling we mustn't have been purling you mustn't have been purling they mustn't have been purling

Interrogative form

Simple form	V-ing form
must I purl? must you purl? must he purl? must we purl? must you purl? must they purl?	must I be purling? must you be purling? must he be purling? must we be purling? must you be purling? must they be purling?
Perfect	V-ing perfect
must I have purled? must you have purled? must he have purled? must we have purled? must you have purled? must they have purled?	must I have been purling? must you have been purling? must he have been purling? must we have been purling? must you have been purling? must they have been purling?

Interro-negative form

Simple form	V-ing form
mustn't I purl? mustn't you purl? mustn't he purl? mustn't we purl? mustn't you purl? mustn't they purl?	mustn't I be purling? mustn't you be purling? mustn't he be purling? mustn't we be purling? mustn't you be purling? mustn't they be purling?
Perfect	V-ing perfect
mustn't I have purled? mustn't you have purled? mustn't he have purled? mustn't we have purled? mustn't you have purled? mustn't they have purled?	mustn't I have been purling? mustn't you have been purling? mustn't he have been purling? mustn't we have been purling? mustn't you have been purling? mustn't they have been purling?